package com.bjc.netty.simple;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

/**
 * @program: nettypro
 * @description:
 * @author: bjc
 * @create: 2021-09-07 20:52
 */
public class NettyClient {

    public static void main(String[] args) throws InterruptedException {
        //客户端需要一个事件循环组
        NioEventLoopGroup group = new NioEventLoopGroup();
        try {
            //创建客户端启动对象
            //注意客户端使用的不是ServerBootstrap而是BootStrap
            Bootstrap bootstrap = new Bootstrap();

            //设置相关参数
            bootstrap.group(group)//设置线程组
                    .channel(NioSocketChannel.class) //设置客户端通道的实现类（反射）
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            //加入自己的处理器
                            ch.pipeline().addLast(new NettyClientHandler());
                        }
                    });
            System.out.println("客户端 ok...");
            //启动客户端去连接服务器端
            //关于ChannelFuture要分析，涉及到netty的异步模型
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 6668);
            //给关闭通道进行监听
            channelFuture.channel().closeFuture().sync();
        }finally {
            group.shutdownGracefully();
        }
    }
}
